Talk:Short-circuit evaluation: Difference between revisions

::::Notice that "and then" and "or else" are part of the Ada and Pascal standards. (the extended Pascal flavor, or ISO 10206, of course not the nonstandard Borland dialects) It would arguably be nice if short-circuit was the default. Likewise, it would be nice if statements like "integer n = 0" in a function were executed at each function call. But Fortran is not C. :) [[User:Arbautjc|Arbautjc]] ([[User talk:Arbautjc|talk]]) 19:17, 4 May 2015 (UTC)

:::::Humm. I look in the compiler "help" system, and see for example <code>COMPLEX :: cube_root = (-0.5, 0.867)</code> both declaring and initialising a variable. Whether this value would apply to only the first invocation or to every invocation presumably depends on further opportunities for declaring STATIC and AUTOMATIC and SAVE, but no matter. PL/I also has a declare and initialise protocol.

So, the options are that a language/compiler

:1) takes the expression at face value, computes both parts and then performs the '''or''' or '''and''', exactly as written.